I have an 02 lb7 crew cab short bed. The upgrades it currently has are the k&n cold air intake, banks bighead wastegate actuator, twin cooling fans, and an economy tune with the diablosport predator. I just took a couple 200 mile highway trips, and set the cruise at 72mph. Both times I filled up I did the calculations and I was getting 15.5-16.5mpg? I know for sure I should be getting better than this unloaded. Any ideas on why the MPG is this Low? and any ideas for increasing the mileage?